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Concentration questions » dilution when molarities are known
Calculate the amount of water needed to prepare 0.25 M solution from 25 mL of 6.00 M sulfuric acid.
This is simple dilution question, that we can try to solve using equation 12.2:
12.2We have cM1=6.00, V1=25 and cMF=0.25. Solving for VF we get VF=6.00×25/0.25=600 mL. This is the final volume, but we already had 25 mL of solution, so we have to add 600-25=575 mL of water.
Such an approach - although in most cases precise enough - can lead to errors, if the solutions are more concentrated. See next dilution question.
